cbs, on on why armstrong didn't think it was wrong. >> reporter: lance armstrong's long awaited confession came, after oprah winfrey's first question. >> did you ever take banned substances to enhance your cycling performance? >> yes. >> reporter: armstrong told the world his unprecedented cycling career would not have been possible without doping. >> i viewed this situation as one big lie that i repeated a lot of times. >> reporter: the disgraced cyclist said he used blood transfusions, testosterone and the blood booster epo to get ahead. >> it did not even feel wrong? >> no. scary. >> reporter: armstrong does not consider his conduct cheating. he said it leveled the playing field during a time when many competitors were also doping. >> i didn't invent the culture, but i didn't try to stop the culture. >> reporter: he denied threatening teammates on the u.s. postal service team to use drugs, but he admitted bullying them to do just about everything else his way. >> it's a major flaw, and it's a guy who expected to get whatever he wanted and to control every outcome. >> reporter: the u.s.